These Clover Quick Locking Stitch Markers can be used in both locked and unlocked positions. Their undulated design prevents stretching of stitches. Their vibrant colors make them easy to find. Use locking stitch markers to count rows, to mark the front or back of your work, to mark the first stitch of a popcorn stitch, and to mark anything else you need to mark in your knitting and crochet. Each package contains 20 pieces.